First for some signs warning against trespassing!
Then come the signs against lesser offenses like driving carelessly!
Or perhaps, you were thinking of shoplifting!
And then there is this sign for people who like to do inexplicably stupid things!
Unfortunately, I would have more trouble explaining this warning to my children than it would be worth!
And then there is the perennial classic as far as warnings to parents go!
And lastly, we have a sign that is made more effective with a nice prop!